The Rab Ionosphere 5.5 is an Inflatable sleeping pad rated R5.5, weighing 24.3 oz in its Regular size. It measures 3.1 in thick across 2 sizes.
InflatableType
RectangularShape
GearScore74/ 100Overall, on the default algorithm
MSRPn/sRegular size · list price
Value Scoren/sBang for buck: price per GearScore point
Warmth (R-value)R 5.5Resistance to heat loss into the ground
GearScore breakdown
How this pad earns its 74 on the default algorithm, factor by factor
Have specific needs in mind — winter camping, ultralight backpacking, or a pad on a budget? Rank this pad against every other on your own custom scoring algorithm.
Open the full pad comparison →Specifications
| Type: | Inflatable |
|---|---|
| Shape: | Rectangular |
| R-value: | 5.5 |
| Thickness: | 3.1 in8.0 cm |
| Inflation: | Pump sack |
| Fabric: | n/sD bottom / 20D top |
| Durability score: | 12/100 |
| Features: | Pump sack included, Repair kit included |
Sizes
| Size | Weight | Dimensions | Packed | Price |
|---|---|---|---|---|
| Regular default | 24.3 oz690 g | 720×201 in1830×510 cm | 9.4×4.7 in24.0×12.0 cm | n/s |
| Long Wide | 2 lb 1.5 oz950 g | 772×252 in1960×640 cm | 11.8×5.5 in30.0×14.0 cm | n/s |
How scoring works
The same GearScore engine the comparison pages use. This is the default weighting; open the full comparison to re-weight it around your trip.
GearScore blends published specs into one 0 to 100 number. Warmth is a "good enough" gate; the rest score on a sliding scale. Price is a lever you turn on when budget matters.
Customize on the full comparison →Warmth26%
Weight40%
Packed size23%
Price0% · lever
Durability11%
- Sufficiency
- Only needs to be good enough. Warmth works this way: clear your target and you're set, extra warmth adds no points.
- Monotonic
- More (or less) is always better. Lighter beats heavier and smaller packs beat bigger, so they score on a sliding scale.
- Preference
- Type, shape, and inflation are personal preference, never scored. They only filter the list.